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                    1.4.4 最大流
            
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                    3.1 一致性模式与理论
            
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                    3.5 几种一致性方案
            
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                    4.1 线性规划
            
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                    4.3 目标规划
            
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                    4.5 动态规划
            
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                    4.6 排队论
            
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                    4.7 博弈论
            
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                    1 设计模式
            
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                    1.1 策略模式
            
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                    1.2 原型模式
            
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                    1.3 单例模式
            
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                    1.4 工厂模式
            
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                    1.5 桥接模式
            
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                    1.6 组合模式
            
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                    1.7 门面模式
            
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                    1.8 适配器模式
            
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                    1.9 装饰者模式
            
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                    1.10 享元模式
            
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                    1.11 代理模式
            
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                    1.12 中间件模式
            
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                    2 网络编程
            
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                    2.1 长连接
            
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                    2.2 MQ
            
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                    3 语言应用
            
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                    3.1 Node.js
            
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                    3.1.1 原理及构成
            
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                    3.1.2 异步机制
            
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                    3.1.3 一些核心概念
            
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                    3.1.4 web应用: koa框架
            
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                    3.1.5 koa源码分析
            
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                    3.1.6 libuv网络库应用
            
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                    3.1.7 性能调优
            
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                    3.1.8 其他: Node爬虫
            
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                    3.1.9 其他: Node编写Mapreduce
            
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                    3.2 C/C++
            
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                    3.2.1 面向对象
            
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                    3.2.2 进程通信
            
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                    3.2.3 线程管理
            
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                    3.2.4 内存管理
            
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                    3.2.5 网络编程
            
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                    3.2.6 构建工具
            
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        <li class="chapter " data-level="1.3.3.2.7" data-path="../c/thread_pool.html">
            
                <a href="../c/thread_pool.html">
            
                    
                    3.2.7 其他: 线程池
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4" data-path="../../engineering/ci_deplopment/">
            
                <a href="../../engineering/ci_deplopment/">
            
                    
                    三 搭建部署
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.1" data-path="../../engineering/ci_deplopment/test.html">
            
                <a href="../../engineering/ci_deplopment/test.html">
            
                    
                    3.1 测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.1.1" data-path="../../engineering/ci_deplopment/test/unit_testing.html">
            
                <a href="../../engineering/ci_deplopment/test/unit_testing.html">
            
                    
                    3.1.1 单元测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.1.2" data-path="../../engineering/ci_deplopment/test/stress_testing.html">
            
                <a href="../../engineering/ci_deplopment/test/stress_testing.html">
            
                    
                    3.1.2 压力测试
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.2" data-path="../../engineering/ci_deplopment/ci_readme.html">
            
                <a href="../../engineering/ci_deplopment/ci_readme.html">
            
                    
                    3.2 集成
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.2.1" data-path="../../engineering/ci_deplopment/ci/gitlab_ci.html">
            
                <a href="../../engineering/ci_deplopment/ci/gitlab_ci.html">
            
                    
                    3.2.1 GitLab CI
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.2.2" data-path="../../engineering/ci_deplopment/ci/spinnaker.html">
            
                <a href="../../engineering/ci_deplopment/ci/spinnaker.html">
            
                    
                    3.2.2 Spinnaker
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.3" data-path="../../engineering/ci_deplopment/build.html">
            
                <a href="../../engineering/ci_deplopment/build.html">
            
                    
                    3.3 部署
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.3.1" data-path="../../engineering/ci_deplopment/k8s/k8s.html">
            
                <a href="../../engineering/ci_deplopment/k8s/k8s.html">
            
                    
                    3.3.1 k8s
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.3.2" data-path="../../engineering/ci_deplopment/rancher/rancher.html">
            
                <a href="../../engineering/ci_deplopment/rancher/rancher.html">
            
                    
                    3.3.2 rancher
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.3.3" data-path="../../engineering/ci_deplopment/swarm/swarm.html">
            
                <a href="../../engineering/ci_deplopment/swarm/swarm.html">
            
                    
                    3.3.3 swarm
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.4" data-path="../../engineering/ci_deplopment/maintenance.html">
            
                <a href="../../engineering/ci_deplopment/maintenance.html">
            
                    
                    3.4 监控
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.4.1" data-path="../../engineering/ci_deplopment/monitor.html">
            
                <a href="../../engineering/ci_deplopment/monitor.html">
            
                    
                    3.4.1 容器监控
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.4.2" data-path="../../engineering/ci_deplopment/trace.html">
            
                <a href="../../engineering/ci_deplopment/trace.html">
            
                    
                    3.4.2 系统监控
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.4.3" data-path="../../engineering/ci_deplopment/app1.md">
            
                <span>
            
                    
                    3.4.2 应用监控
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.5" data-path="../../engineering/ha/ha.html">
            
                <a href="../../engineering/ha/ha.html">
            
                    
                    3.5 高可用
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.5.1" data-path="../../engineering/ha/client.html">
            
                <a href="../../engineering/ha/client.html">
            
                    
                    3.5.1 接入层高可用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.5.2" data-path="../../engineering/ha/service.html">
            
                <a href="../../engineering/ha/service.html">
            
                    
                    3.5.2 服务层高可用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.5.3" data-path="../../engineering/ha/share.html">
            
                <a href="../../engineering/ha/share.html">
            
                    
                    3.5.3 存储层高可用
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.4.6" data-path="../../engineering/ci_deplopment/hc/hc.html">
            
                <a href="../../engineering/ci_deplopment/hc/hc.html">
            
                    
                    3.6 高并发
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.4.6.1" data-path="../../engineering/ci_deplopment/hc/dns.html">
            
                <a href="../../engineering/ci_deplopment/hc/dns.html">
            
                    
                    3.6.1 基于DNS的负载均衡
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.6.2" data-path="../../engineering/ci_deplopment/hc/lvs.html">
            
                <a href="../../engineering/ci_deplopment/hc/lvs.html">
            
                    
                    3.6.2 基于Lvs的负载均衡
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.4.6.3" data-path="../../engineering/ci_deplopment/hc/haproxy.html">
            
                <a href="../../engineering/ci_deplopment/hc/haproxy.html">
            
                    
                    3.6.3 基于haproxy的负载均衡
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5" >
            
                <span>
            
                    
                    四 架构模式
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1" >
            
                <span>
            
                    
                    1 微服务架构设计与实践
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.1.1" data-path="spring-cloud.html">
            
                <a href="spring-cloud.html">
            
                    
                    1.1 微服务概况
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.2" data-path="spring-eureka.html">
            
                <a href="spring-eureka.html">
            
                    
                    1.2 服务注册及发现
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.3" data-path="spring-feign.html">
            
                <a href="spring-feign.html">
            
                    
                    1.3 服务调用
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.4" data-path="spring-zuul.html">
            
                <a href="spring-zuul.html">
            
                    
                    1.4 网关及负载均衡
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="1.5.1.5" data-path="spring-hystrix.html">
            
                <a href="spring-hystrix.html">
            
                    
                    1.5 熔断、限流、扩缩容
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.6" data-path="spring-config.html">
            
                <a href="spring-config.html">
            
                    
                    1.6 云配置中心
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.7" data-path="zipkin-tracing.html">
            
                <a href="zipkin-tracing.html">
            
                    
                    1.7 分布式链路追踪
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.1.8" data-path="swagger.html">
            
                <a href="swagger.html">
            
                    
                    1.8 接口文档管理
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.2" data-path="../../domain/">
            
                <a href="../../domain/">
            
                    
                    2 领域驱动模型
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.2.1" data-path="../../domain/domain.html">
            
                <a href="../../domain/domain.html">
            
                    
                    2.1 领域--Domain
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.2" data-path="../../domain/entity.md">
            
                <span>
            
                    
                    2.2 领域实体--Entity
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.3" data-path="../../domain/object.html">
            
                <a href="../../domain/object.html">
            
                    
                    2.3 值对象--Value Object
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.4" data-path="../../domain/aggregate.html">
            
                <a href="../../domain/aggregate.html">
            
                    
                    2.4 聚合--Aggregate
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.5" data-path="../../domain/service.html">
            
                <a href="../../domain/service.html">
            
                    
                    2.5 服务--Services
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.6" data-path="../../domain/event.html">
            
                <a href="../../domain/event.html">
            
                    
                    2.6 领域事件--Event
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.2.7" data-path="../../domain/framework.html">
            
                <a href="../../domain/framework.html">
            
                    
                    2.7 几种常见的DDD架构
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.5.3" >
            
                <span>
            
                    
                    3 架构技术的演化与趋势
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.5.3.1" >
            
                <span>
            
                    
                    3.1 架构技术的发展历史及现状
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.3.2" >
            
                <span>
            
                    
                    3.2 Serverless无服务架构概念
            
                </span>
            

            
        </li>
    
        <li class="chapter " data-level="1.5.3.3" >
            
                <span>
            
                    
                    3.3 ServerMesh网格服务概念
            
                </span>
            

            
        </li>
    

            </ul>
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.6" >
            
                <span>
            
                    
                    五 其他
            
                </span>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.6.1" data-path="../../story/talk.html">
            
                <a href="../../story/talk.html">
            
                    
                    5.1 小伙子,放松!
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    

    <li class="divider"></li>

    <li>
        <a href="https://www.gitbook.com" target="blank" class="gitbook-link">
            本书使用 GitBook 发布
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                                <h3 id="&#x4E00;&#x3001;&#x7B80;&#x4ECB;">&#x4E00;&#x3001;&#x7B80;&#x4ECB;</h3>
<p>&#xA0;&#xA0;&#xA0;&#xA0;&#x670D;&#x52A1;&#x964D;&#x7EA7;&#x3001;&#x6545;&#x969C;&#x9694;&#x79BB;&#x3001;&#x8BBF;&#x95EE;&#x9650;&#x6D41;&#xFF0C;&#x81EA;&#x52A8;&#x6269;&#x7F29;&#x5BB9;&#x529F;&#x80FD;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code>1&#x3001;&#x670D;&#x52A1;&#x4FDD;&#x62A4;&#xFF0C;&#x5FAE;&#x670D;&#x52A1;&#x4E92;&#x76F8;&#x8C03;&#x7528;&#x65F6;&#xFF0C;&#x9488;&#x5BF9;&#x8D85;&#x65F6;&#x548C;&#x8C03;&#x7528;&#x9519;&#x8BEF;&#x8FDB;&#x884C;&#x65AD;&#x8DEF;&#xFF0C;&#x9632;&#x6B62;&#x96EA;&#x5D29;&#x6548;&#x5E94;
2&#x3001;&#x670D;&#x52A1;&#x964D;&#x7EA7;&#xFF0C;&#x5F00;&#x542F;fallback&#xFF0C;&#x5F53;&#x8C03;&#x7528;&#x9519;&#x8BEF;&#x8FD4;&#x56DE;&#x964D;&#x7EA7;&#x64CD;&#x4F5C;&#x7684;&#x7ED3;&#x679C;
3&#x3001;&#x9AD8;&#x5E76;&#x53D1;&#x573A;&#x666F;&#x4E0B;&#xFF0C;&#x5BF9;&#x6D41;&#x91CF;&#x9650;&#x6D41;&#x6216;&#x81EA;&#x52A8;&#x6269;&#x7F29;&#x5BB9;&#xFF0C;&#x5982;&#x5E94;&#x5BF9;&#x7F13;&#x5B58;&#x7A7F;&#x900F;&#x7B49;&#x95EE;&#x9898;
4&#x3001;&#x6545;&#x969C;&#x9694;&#x79BB;&#xFF0C;&#x9488;&#x5BF9;&#x5355;&#x72EC;&#x7684;&#x8BF7;&#x6C42;&#x5F00;&#x542F;circuit breaker
</code></pre><ul>
<li>1.1 &#x5E38;&#x7528;&#x6280;&#x672F;</li>
</ul>
<p>&#xA0;&#xA0;&#xA0;&#xA0;Netflix&#x7684;&#x5F00;&#x6E90;&#x7EC4;&#x4EF6;hystrix&#x5728;&#x4E1A;&#x754C;&#x88AB;&#x5E7F;&#x6CDB;&#x4F7F;&#x7528;&#xFF0C;&#x5982;&#x7F51;&#x6613;&#x4E91;&#x66FE;&#x501F;&#x52A9;hystrix&#x5B9E;&#x73B0;&#x65AD;&#x8DEF;&#x5668;&#xFF0C;&#x5E38;&#x7528;&#x7684;&#x7194;&#x65AD;&#x9650;&#x6D41;&#x6280;&#x672F;&#x5305;&#x62EC;:</p>
<pre><code>1&#x3001;&#x8BA1;&#x6570;&#x5668;: &#x7CFB;&#x7EDF;&#x7EF4;&#x62A4;&#x4E00;&#x4E2A;&#x8BA1;&#x6570;&#x5668;&#xFF0C;&#x6BCF;&#x6B21;&#x8BF7;&#x6C42;&#x5219;&#x52A0;1&#xFF0C;&#x5230;&#x8FBE;&#x67D0;&#x4E2A;&#x9608;&#x503C;&#x65F6;&#x5219;&#x4E0D;&#x518D;&#x63A5;&#x53D7;&#x8BF7;&#x6C42;
2&#x3001;&#x961F;&#x5217;: &#x6240;&#x6709;&#x8BF7;&#x6C42;&#x90FD;&#x8FDB;&#x5165;&#x961F;&#x5217;&#xFF0C;&#x7136;&#x540E;&#x4F9D;&#x6B21;&#x5904;&#x7406;
3&#x3001;&#x4EE4;&#x724C;&#x6876;: &#x540E;&#x53F0;&#x4EFB;&#x52A1;&#x4EE5;&#x7A33;&#x5B9A;&#x6216;&#x52A8;&#x6001;&#x7684;&#x901F;&#x7387;&#x5F80;&#x4EE4;&#x724C;&#x6876;&#x4E2D;&#x6DFB;&#x52A0;&#x4EE4;&#x724C;&#xFF0C;&#x6BCF;&#x6B21;&#x63A5;&#x53D7;&#x5230;&#x8BF7;&#x6C42;&#x5219;&#x6D88;&#x8D39;&#x4EE4;&#x724C;&#xFF0C;&#x5B9E;&#x73B0;&#x52A8;&#x6001;&#x6D41;&#x91CF;&#x63A7;&#x5236;,&#x5982;Guava&#x4E2D;&#x7684;RateLimiter&#x3002;
</code></pre><h3 id="&#x4E8C;&#x3001;&#x5B9E;&#x73B0;">&#x4E8C;&#x3001;&#x5B9E;&#x73B0;</h3>
<p>&#xA0;&#xA0;&#xA0;&#xA0;&#x901A;&#x5E38;&#x4F1A;&#x5728;&#x7F51;&#x5173;&#x6D41;&#x91CF;&#x5206;&#x53D1;&#x548C;&#x5FAE;&#x670D;&#x52A1;&#x4E4B;&#x95F4;&#x8C03;&#x7528;&#x6DFB;&#x52A0;&#x7194;&#x65AD;&#xFF0C;&#x5BF9;&#x4E8E;java&#x751F;&#x6001;&#xFF0C;spring cloud&#x7684;feign&#x5DF2;&#x9ED8;&#x8BA4;&#x96C6;&#x6210;hystrix&#xFF0C;&#x7531;&#x4E8E;&#x6211;&#x4EEC;&#x9879;&#x76EE;&#x5927;&#x91CF;&#x7528;Node&#x5B9E;&#x73B0;&#x4E2D;&#x95F4;&#x4EF6;&#x4E0E;&#x4E00;&#x4E9B;&#x5171;&#x4EAB;&#x4E1A;&#x52A1;&#xFF0C;&#x8FD9;&#x91CC;&#x53C2;&#x8003;hystrix&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;Node&#x7248;&#x7684;&#x7194;&#x65AD;&#x7EC4;&#x4EF6;&#x3002;
<img src="http://cdn.find-world.top/hystrix_1.png" alt="hystrix_1"></p>
<ul>
<li>2.1 &#x7194;&#x65AD;&#x9650;&#x6D41;</li>
</ul>
<p>&#xA0;&#xA0;&#xA0;&#xA0;hystrix&#x539F;&#x751F;&#x7EC4;&#x4EF6;&#x4E2D;&#xFF0C;&#x53EF;&#x9650;&#x6D41;&#x91C7;&#x7528;&#x4FE1;&#x53F7;&#x91CF;&#x4E0E;&#x7EBF;&#x7A0B;&#x6C60;&#x4E24;&#x79CD;&#x65B9;&#x5F0F;&#xFF0C;&#x5176;&#x4E2D;&#x4FE1;&#x53F7;&#x91CF;&#x901A;&#x8FC7;&#x9488;&#x5BF9;&#x6BCF;&#x4E00;&#x4E2A;command&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x8BA1;&#x6570;&#x5668;&#x6765;&#x5B9E;&#x73B0;&#xFF0C;&#x65E0;timeout&#x673A;&#x5236;&#xFF0C;&#x7EBF;&#x7A0B;&#x6C60;&#x5219;&#x901A;&#x8FC7;&#x521D;&#x59CB;&#x5316;&#x5F53;&#x524D;&#x7684;&#x6570;&#x91CF;&#x548C;&#x521B;&#x5EFA;&#x901A;&#x6765;&#x63A7;&#x5236;&#x5E76;&#x53D1;&#x3002;&#x5728;&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x901A;&#x8FC7;Node&#x7684;&#x4E8B;&#x4EF6;&#x5FAA;&#x73AF;&#x548C;&#x4EE4;&#x724C;&#x6876;&#x7684;&#x65B9;&#x5F0F;&#x5B9E;&#x73B0;&#x9650;&#x6D41;&#xFF0C;&#x6B64;&#x79CD;&#x65B9;&#x5F0F;&#x53EF;&#x52A8;&#x6001;&#x6A21;&#x62DF;&#x5F53;&#x524D;&#x8BF7;&#x6C42;&#x7684;&#x5E76;&#x53D1;&#x91CF;&#xFF0C;&#x5E94;&#x7528;&#x5982;&#x4E0B;&#x3002;</p>
<table>
<thead>
<tr>
<th style="text-align:center">&#x5E8F;&#x53F7;</th>
<th style="text-align:center">&#x53C2;&#x6570;</th>
<th style="text-align:center">&#x4F5C;&#x7528;</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">1</td>
<td style="text-align:center">name</td>
<td style="text-align:center">&#x7194;&#x65AD;&#x540D;</td>
</tr>
<tr>
<td style="text-align:center">2</td>
<td style="text-align:center">threshold</td>
<td style="text-align:center">&#x6253;&#x5F00;&#x7194;&#x65AD;&#x7684;&#x9608;&#x503C;</td>
</tr>
<tr>
<td style="text-align:center">3</td>
<td style="text-align:center">waitThreshold</td>
<td style="text-align:center">&#x6253;&#x5F00;&#x65AD;&#x8DEF;&#x5668;&#x7684;&#x6700;&#x5C11;&#x8BF7;&#x6C42;&#x6570;&#xFF0C;&#x5982;&#x8BBE;&#x7F6E;&#x4E3A;100&#xFF0C;&#x5373;&#x4FBF;&#x5F53;&#x524D;&#x8BF7;&#x6C42;&#x6709;99&#x4E2A;&#x90FD;&#x5931;&#x8D25;&#x4E5F;&#x4E0D;&#x4F1A;&#x5F00;&#x542F;</td>
</tr>
<tr>
<td style="text-align:center">4</td>
<td style="text-align:center">circuitDuration</td>
<td style="text-align:center">&#x7194;&#x65AD;&#x6301;&#x7EED;&#x65F6;&#x95F4;</td>
</tr>
<tr>
<td style="text-align:center">5</td>
<td style="text-align:center">timeout</td>
<td style="text-align:center">&#x7194;&#x65AD;&#x8D85;&#x65F6;&#x65F6;&#x95F4;</td>
</tr>
<tr>
<td style="text-align:center">6</td>
<td style="text-align:center">bucketNum</td>
<td style="text-align:center">&#x4EE4;&#x724C;&#x6876;&#x6570;&#x91CF;</td>
</tr>
</tbody>
</table>
<pre><code class="lang-js">
<span class="hljs-keyword">const</span> Brakes = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;Brakes&apos;</span>);
<span class="hljs-keyword">const</span> { setCache, getCache } = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;./lib/cache&apos;</span>)

<span class="hljs-comment">/** 
 * @params {func} int target function
 * @parmas {opts} count default conf
 */</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">CircuitBreaker</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Brakes</span> </span>{
  <span class="hljs-keyword">constructor</span>(func, opts) {
    <span class="hljs-keyword">super</span>(func, opts);
  }

}

<span class="hljs-built_in">module</span>.exports = CircuitBreaker;


<span class="hljs-keyword">const</span> tryRequest = <span class="hljs-keyword">async</span> (fnName = <span class="hljs-string">&apos;tryRequest&apos;</span>) =&gt; {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">`---------- this is try request <span class="hljs-subst">${fnName}</span>----------`</span>)
  <span class="hljs-keyword">if</span>(<span class="hljs-built_in">Math</span>.random(<span class="hljs-number">1</span>) * <span class="hljs-number">1</span> &lt; <span class="hljs-number">0.2</span>) {
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">await</span> <span class="hljs-number">1</span>;
  }

  <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Error</span>();
}

<span class="hljs-keyword">const</span> fallback = (fnName = <span class="hljs-string">&apos;fallback&apos;</span>) =&gt; {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">`---------- this is fallback <span class="hljs-subst">${fnName}</span>----------`</span>)
}

<span class="hljs-keyword">const</span> opts = {
  statInterval: <span class="hljs-number">2500</span>,
  threshold: <span class="hljs-number">0.5</span>,
  circuitDuration: <span class="hljs-number">15000</span>,
  timeout: <span class="hljs-number">3000</span>,
  bucketSpan: <span class="hljs-number">3000</span>,
  bucketNum: <span class="hljs-number">100</span>,
}

<span class="hljs-keyword">const</span> circuitBreaker = <span class="hljs-keyword">new</span> CircuitBreaker(tryRequest, opts);

circuitBreaker.on(<span class="hljs-string">&apos;snapshot&apos;</span>, snapshot =&gt; {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;snapshot running at:&apos;</span>, snapshot, snapshot.stats.successful, snapshot.stats.total);
});

circuitBreaker.on(<span class="hljs-string">&apos;circuitOpen&apos;</span>, () =&gt; {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;----------Circuit Opened--------------&apos;</span>);
});

circuitBreaker.on(<span class="hljs-string">&apos;circuitClosed&apos;</span>, () =&gt; {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;----------Circuit Closed--------------&apos;</span>);
});

circuitBreaker.fallback(fallback);

setInterval(() =&gt; {
  circuitBreaker.exec(<span class="hljs-string">&apos;data&apos;</span>)
    .then((data) =&gt; {
      <span class="hljs-built_in">console</span>.log(<span class="hljs-string">`Successful data is : <span class="hljs-subst">${data}</span>`</span>);
    })
    .catch(err =&gt; {
      <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;Failure&apos;</span>, err || <span class="hljs-string">&apos;&apos;</span>);
    });
}, <span class="hljs-number">3000</span>);
</code></pre>
<p>&#x8F93;&#x51FA;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code>master:node-circuit-breaker dreamboad$ node test.js
snapshot running at: 0 0
---------- this is try request data----------
---------- this is fallback data----------
Successful data is : undefined
snapshot running at: 0 1
---------- this is try request data----------
---------- this is fallback data----------
Successful data is : undefined
snapshot running at: 0 2
---------- this is try request data----------
Successful data is : 1
snapshot running at: 1 3
</code></pre><ul>
<li>2.2 &#x81EA;&#x52A8;&#x6269;&#x7F29;&#x5BB9;</li>
</ul>
<p>&#xA0;&#xA0;&#xA0;&#xA0;k8s&#x539F;&#x751F;&#x8D44;&#x6E90;&#x76D1;&#x63A7;&#x7EC4;&#x4EF6;&#x5305;&#x62EC;metrics-server&#x3001;Heapster&#xFF0C;&#x4ECE;Kubernetes1.8&#x5F00;&#x59CB;&#xFF0C;pod&#x7684;metrics&#x4FE1;&#x606F;&#x5DF2;&#x9ED8;&#x8BA4;&#x6765;&#x6E90;&#x81EA;metrics-server&#xFF0C;&#x800C;&#x975E;Heapster&#x3002;HPA&#x5168;&#x79F0;Horizontal Pod Autoscaling&#xFF0C;&#x5373;pod&#x7684;&#x6C34;&#x5E73;&#x81EA;&#x52A8;&#x6269;&#x5C55;&#xFF0C;HPA&#x63A7;&#x5236;&#x5668;&#x9ED8;&#x8BA4;&#x6BCF;&#x9694;30&#x79D2;&#x5C31;&#x4F1A;&#x8FD0;&#x884C;&#x4E00;&#x6B21;&#xFF0C;&#x5176;&#x64CD;&#x4F5C;&#x5BF9;&#x8C61;&#x662F;RC&#x3001;RS&#x6216;Deployment&#x5BF9;&#x5E94;&#x7684;Pod&#x3002;</p>
<p>&#x82E5;&#x8981;&#x5B9E;&#x73B0;HPA&#x529F;&#x80FD;&#xFF0C;&#x9996;&#x5148;&#x9700;&#x8981;&#x68C0;&#x67E5;metric&#x662F;&#x5426;&#x5F00;&#x542F;:</p>
<pre><code>master:spero-migrate-finance-service dreamboad$ kubectl top nodes 
NAME                                 CPU(cores)   CPU%      MEMORY(bytes)   MEMORY%   
cn-shanghai.i-1   468m         23%       2592Mi          70%       
cn-shanghai.i-4   282m         14%       3130Mi          84%       
cn-shanghai.i-3   1047m        13%       10920Mi         73%       
cn-shanghai.i-7   709m         8%        9747Mi          65%       
cn-shanghai.i-8   609m         7%        12944Mi         86%       
cn-shanghai.i-2   133m         6%        2560Mi          69%       
cn-shanghai.i-5   672m         8%        7172Mi          48%       
cn-shanghai.i-6   823m         10%       7215Mi          48%       
cn-shanghai.i-7   331m         4%        6879Mi          46%
</code></pre><p>&#xA0;&#xA0;&#xA0;&#xA0;&#x4EE5; <code>spero-migrate-finance-service</code> pod &#x4E3A;&#x4F8B;&#xFF0C;&#x5F00;&#x542F;&#x5BF9;&#x5E94;<code>spero-migrate-finance-service</code> &#x7684;HPA, &#x6267;&#x884C;&#x5982;&#x4E0B; <code>kubectl apply -f hpa.yaml</code>,</p>
<pre><code class="lang-yaml"><span class="hljs-attr">apiVersion:</span> autoscaling/v2beta1
<span class="hljs-attr">kind:</span> HorizontalPodAutoscaler
<span class="hljs-attr">metadata:</span>
<span class="hljs-attr">  name:</span> spero-migrate-finance-service
<span class="hljs-attr">  namespace:</span> spero-dev
<span class="hljs-attr">spec:</span>
<span class="hljs-attr">  scaleTargetRef:</span>
<span class="hljs-attr">    apiVersion:</span> extensions/v1beta1
<span class="hljs-attr">    kind:</span> Deployment
<span class="hljs-attr">    name:</span> spero-migrate-finance-service
<span class="hljs-attr">  minReplicas:</span> <span class="hljs-number">2</span>
<span class="hljs-attr">  maxReplicas:</span> <span class="hljs-number">5</span>
<span class="hljs-attr">  metrics:</span>
<span class="hljs-attr">  - type:</span> Resource
<span class="hljs-attr">    resource:</span>
<span class="hljs-attr">      name:</span> cpu
<span class="hljs-attr">      targetAverageUtilization:</span> <span class="hljs-number">20</span>
<span class="hljs-attr">  - type:</span> Resource
<span class="hljs-attr">    resource:</span>
<span class="hljs-attr">      name:</span> memory
<span class="hljs-attr">      targetAverageValue:</span> <span class="hljs-number">200</span>Mi
</code></pre>
<p>&#xA0;&#xA0;&#xA0;&#xA0;&#x68C0;&#x67E5;&#x8BE5;pod&#x7684;HPA&#x63A7;&#x5236;&#x5668;&#x662F;&#x5426;&#x5F00;&#x542F;&#xFF1A;</p>
<pre><code>master:spero-migrate-finance-service dreamboad$ kubectl get hpa 
NAME                            REFERENCE                                  TARGETS                  MINPODS   MAXPODS   REPLICAS   AGE
spero-migrate-finance-service   Deployment/spero-migrate-finance-service   95727616/200Mi, 1%/80%   2         5         2          2m
</code></pre><p>&#x7136;&#x540E;&#x901A;&#x8FC7;&#x538B;&#x6D4B;&#x6D4B;&#x8BD5;&#x6269;&#x5BB9;&#x662F;&#x5426;&#x751F;&#x6548;&#xFF0C; &#x8BBE;&#x7F6E;&#x5E76;&#x53D1;&#x91CF;500&#xFF1A;</p>
<p><img src="http://cdn.find-world.top/hystrix_4.png" alt="hystrix_2"></p>
<p>&#x538B;&#x6D4B;&#x524D;&#x5B9E;&#x4F8B;&#x72B6;&#x6001;&#xFF1A;</p>
<pre><code>master:images dreamboad$ kubectl top pods | grep finance 
spero-migrate-finance-service-75958dc66d-bs6fs   2m           112Mi           
spero-migrate-finance-service-75958dc66d-rjg4b   3m           108Mi
</code></pre><p>&#x538B;&#x6D4B;&#x6301;&#x7EED;&#x4E00;&#x5206;&#x949F;&#x540E;&#xFF1A;</p>
<pre><code>master:spero-migrate-finance-service dreamboad$ kubectl get pods | grep finance 
spero-migrate-finance-service-75958dc66d-bs6fs   1/1       Running     0          35d
spero-migrate-finance-service-75958dc66d-rjg4b   1/1       Running     0          35d
spero-migrate-finance-service-75958dc66d-wnmhq   1/1       Running     0          54s
</code></pre><p>&#x505C;&#x6B62;&#x538B;&#x6D4B;&#xFF0C;&#x5927;&#x6982;&#x4E24;&#x5206;&#x949F;&#x540E;&#x6062;&#x590D;&#x6B63;&#x5E38;&#xFF1A;</p>
<pre><code>master:spero-migrate-finance-service dreamboad$ kubectl get pod | grep -ir finance 
(standard input):spero-migrate-finance-service-75958dc66d-bs6fs   1/1       Running       0          35d
(standard input):spero-migrate-finance-service-75958dc66d-rjg4b   1/1       Running       0          35d
(standard input):spero-migrate-finance-service-75958dc66d-wnmhq   1/1       Terminating   0          5m
</code></pre><pre><code>master:spero-migrate-finance-service dreamboad$ kubectl top pods  | grep  finance 
spero-migrate-finance-service-75958dc66d-bs6fs   3m           94Mi            
spero-migrate-finance-service-75958dc66d-rjg4b   2m           107Mi
</code></pre><p>&#x6B64;&#x5916;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x81EA;&#x5B9A;&#x4E49;prometheus&#x91C7;&#x96C6;&#x5B9E;&#x65F6;&#x6570;&#x636E;&#x8FDB;&#x800C;&#x5B9E;&#x73B0;k8s&#x7684;HPA&#xFF0C;&#x9632;&#x6B62;&#x670D;&#x52A1;&#x96EA;&#x5D29;&#x8FD8;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5F15;&#x5165;&#x6539;&#x8FDB;&#x7F13;&#x5B58;&#x6A21;&#x5F0F;&#x3001;&#x4F18;&#x5316;&#x670D;&#x52A1;&#x91CD;&#x8BD5;&#x7B56;&#x7565;&#x3001;F5&#x786C;&#x4EF6;&#x7B49;&#x3002;</p>
<h3 id="&#x4E09;&#x3001;&#x53C2;&#x8003;">&#x4E09;&#x3001;&#x53C2;&#x8003;</h3>
<ul>
<li><a href="https://www.npmjs.com/package/brakes" target="_blank">1&#x3001;hystrix</a></li>
<li><a href="https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/" target="_blank">2&#x3001;HPA</a> </li>
</ul>
<footer class="page-footer"><span class="copyright">Copyright &#xA9; &#x4E00;&#x84D1;&#x70DF;&#x96E8;&#x4EFB;&#x5E73;&#x751F; all right reserved&#xFF0C;powered by Gitbook</span><span class="footer-modification">&#x4FEE;&#x6539;&#x65F6;&#x95F4;: 
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